Pump for inflating pneumatic tires



E. P. HULTIN. PUMP FOR INFLATING PNEUMATIC TIRES.

` APPLICATION FILED DIC.22I 1917. 1,349,671.

E. P. HULTIN.

PUMP FOR INFLATiNG PNEUMATIC TIRES.

APPLlcATloN man DEclzz, 1917.

1,349,671, Patented Aug. 17,1920.

3 SHEETS-SHEET 2.

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E. P. HULTIN.

PUMP FOR INFLATING PNEUMATIC TIRES.

APPLICATION FILED DEC. 22, 1917.-

'1,349,671. Patented Alig. 17, 1920 4' 3 SHEETS-SHEET 5/9- 59 numeral 1 indicates a motor car wheel hav- 50 of the axle, orto any `other suitable fixe xUNITED AS12iri'llllli'f OFFICE- nNofcIi 1.` rrunrrn,` "or, Farin, MlmHIGHMY,`

To all whom it may conce/m:

Be it known that LENooH P. HLTIN, a citizenloi' the United States, residing `in thccity of Flint, Genesee county, Stateof Michigan, have invented certainfnew and useful Improvements in Pumps for Inflating Pneumatic Tires, of `which the follow# inlvisa specification."` i i y invention relates to air pumps, and especiall y to automatically operated and governec air pumps` for inflatingpneumatic tires of automobiles, being particularly "intended as an improvement: to the pump sliownand described in my copending patent application,` Serial Number 162,515.`

The main object of my invention is to provide a simple, positive and cheap driving mechanism for the air pump `hereinafter de scribed. Other objects of my invention will be mentioned and described herein.,` y 1 The preferred embodiment of myginvenj tion is Well illustrated in the accompanying drawings, in which Figure 1 is a side elevation `of an indicated vehicle Wheel upon `which my invention is mounted; Fig.2 is

a section lin 'side elevation through" the y pump showing the `driving mechanism and clutches; F ig. 3 is a sectiontaken on the line of Fig. 2; [Figfe is a sectionftaken on the line 4-4 of F1g."5;` Fig. 5 `is a section i taken on the line 5-5`of Fig. 3; Figi. l6 is a section taken on the line 6-6 of Figi 2; Fig;

7 is a section taken on the line 7-7 of Fig.

2; and Fig. 8 is afsection taken on the line 8--8 of F1g.5. y Y S' `ilr` numerals of reference indicate similar members and parts of members throughoutthe `several views `on the drawf` f eferring to the drawings, in detail", the

ing a pneumatic tire` mounted thereon and uponwhich the pump`2, my inventionpis mounted, being here shownfastened tothe spokes of the Wheel by "thestraps Band 4 which` are appropriately fastened fto` the `Wheel spokesin anysuitablernannergj` The numeral 5 indicateslwan annular stationary driver handhaving .spider` arms 6, 6,\the latter being rigidly fastened to" the housing member, at their inner ends, saidba'ndfhaving' a` facin or" lcovering- 7 of leather, or "other suitab e i`nateria1.` f Theynumeral 8` indicatesa pump body having a pluralityof bores `9 and 10 and Within" wli-iehdthe pump rtm1 FOniNFLATINGrNEUMATIG Trans;

sfpeicauonlof Lettersratjet. PatentedfAug. 17, 1920i Application filed December 22, 1917. Serial N0. 208,365. i i f pistons 11 and 12 are reciprocally` arranged, `said plstons `having the piston rods 13 and and i 19 in registration,` respectively, With the bores19 and 10 and adaptedto permit the passage ofthe piston `rods 13 and 14. The numeral: 2() indicatesa drivin shaft provided with the cranks`21 an 22, respec- 1 tively,to which the piston rods 13 and 14, respectively, are operatively connected in any suitable manner, said crank shaftbe` ingjournaled in the bearing boxes 23 and 24 carried upon the bearing brackets 25 and 26, respectively. Numerals 2,7 and `28 in` dicate, respectively, air intake openings formed inthe pump body 8, and registering Withthe pump bores 9 and 10, being adapted tobeoverrun by the pistons on the outer or suction strokelthereof. The numeral 29 indicates a tooth clutch rigidly carried upon the` outerfend" of` the crank shaft `2O and adapted to `mesh "With a` tooth driving clutch, as hereinafter described.

The numeral 30 indicates a `driving shaft bracket carried by the pump body 8, a drivingshaft 31 beingcarried thereby at its outer reduced "end, or portion, 33`wwhich is ,shaft being journaled in a bearing socket`32 formedl in theQclutchf29 axially with "the bearing of the shaft bearing portion 3,3.f

.termediate the shaftbearings andfadjacent the clutch 29, saidclutch 35 having theconventiona-l clutch shifter collar 36 mounted i thereon and being adapted for intermittent engagement With the `clutch 29,j`as hereinafter described.` 11 i i i E; The numeral 37 indicates a driving `pulley "rigidly mounted` upon the vdriving shaft 31,

provided :with a face covering 38-oifleather `and adapted to engage the' leather band, or

facing,7^of the driver band 5 for effecting pulley rotation. `*The numeral 39 indicates `a casinglfor the driving mechanism, being fastened to suitable members bythe screws 4o, 4c` a Thenumeral 41 indicates an 'air discharge port for the pump bore 9andcommunicating with `the transverse airfipassage, I"and the numeral 42 indicates `lain lair' discharge EV; The numeralffindicates a tooth" clutch member splinedto"thefdriving shaft 31 inport placing pump bore in communication with the transverse air passage 44.

The numerals and 46' indicate coin'pound'v check valve members of conventional struc-V ture arranged within the air' passage-s 43 and 44, respectively, andl adapted to adinitair therethrough from' the'pump cylinders 9 and 10 but to check the return thereof. The numeral 47 indicates the pump governor cylinder disposed?intermediate the pump bores 9 and 10 .and having its upper end closed4 byu thek cover 17,- the lower end thereof having asomewhat reducedopening 48.

The numeral 49 indicates .an expansible governor bulb, :preferably made ot substantially' pure. rubber, which. is mounted upon the reduced upper; end ot. the bulb Vcarrier y50 andlfastened thereto bytheclip 51, said carrierl being. arranged withinLthe aperture 48 andsecured rigidly therein by' the nut v52 which is screw threaded upon the lower enthot the bulb carrier 50. Thenumeral 53 indicates an annular iiangeon the carrier and adapt-ed to term a seal on the shoul` der 54 when `drawn tightly against said Vshinilder by tbe nut 52. Thei'iun'ierzd55 indicates a longitudinal air passa-gein the cai'- a rie'rL 5.0,"fin c'ommunieationwith the interior discharge en'djof ahand, oifoot, air pump connectioirfor tire inifiation, as-an auxiliary inlajtioiij-` device.- Th'lenumeral 60 ,indicates a nipplecap screw, threaded upon they nipple 59,tojrcclosing-thesame.

. 'lh'efnumeral 61 indicates a governor pis- Vtoinslidably disposed within the governor cylinder 47j and provided With the-governor bulb chamber 62 .within which the bulb 49 is arranged, said `piston being normally seatedluponpthe flangeL l53 of' the'member 5() by virtueot I the-exertion of the coil spring 63 disposediwithin` the cylinder 47 above said 'piston' andl bearingiagainst theend periph- .erythereoi theiipper. end-.o'hsaid spring beinglfseated upon-thel under side of the cover 17.- The tension of the spring 63 is suchAthatthef piston 671 .is confined Aii-pon its y seat thereby under low and normal air press ures within the tire, but :any pressure in e'iicess of y normal;V orpredetermined, pres- Esure 'will expand the-bulb The numeral 64 indicates a governor piston stop member screw threaded into the cover 17 and adjustable longitudinally of vand within the pump cylinder 47 for limiting the upward travel of the piston 61 to any predetermined limit. The numeral (S5 indicates a? governor arm bracketV carried by and fastened to the piston (5l by a screw 66, said bracket projecting somewhat laterally for slidableA disposition within the upright slot G7 formed in the wall of the bore 47 and in communication therewith. rlie `numeral GS indicates an upright governor-arm projecting from and rigidly iastened to the bracket G5 by a screw 69, said arm ybeing providedwith a plurality of screw apertures 70, at spaced intervals, each of which is adapted to receive the screw G9, whereby vertical adjustment of said arm may be made for timing the shift of the driving shaft clutch, as hereinafter described, and thereby effecting a variable maximum air pressure in the pneumatic tire. The numeral 71 indicates the upper end of the governor aim G8 which is provided with the elongated slot 72, said slot being adapted to be transversely engaged b v the pin 73 which is carried by the forked end ot the lever 74, the latter being rigidly mounted-at its opposite end upon the shaft 75 journaled in the bracket i3d. rlfhe numeral 7G indicates a toi-hed clutch shifter lever rigidly mounted upon the shatt 75, the fork ends whereot engage the trunnions 77 and 78 et the clutch collar 36 in the usual manner for eiii'ecting a shift of said clutch 35 when the lever 7G is oscillated by the movement ot the lever 74. The numeral 79 indicates a lever retraction spring anchored at 80 and connected with the lever 74 at S1 and adapted to normally hold the lever 74 in a retracted condition, whereby the clutches Q9 and 35 are normally engaged.

ln operation, the interior ot ther governor bulb 49 is in permanent communication with ,the interior of the pneumatic tire through the passage 55 and the air-*tube 57 and, therefore, it is always infiated when the pneumatic tire itself is inflated. lVhen the vehicle wheel rotates the driving pulley 37 is-rotated by contact with the band facing 3S around which the pulley moves, thereby rotating the driving shalt 31 and the drivingclutch 35 splined thereto. Y 'As the air `pressure. in the tiie increases the bulb 49Vis'expanded, thereby forcing the piston 61 upward ott its'seat and compressing the spiingl, said piston movement causing the upward movement ot the governor arm 68, whereby the wall of the slot 72 engages the pin 73, thereby oscillating the leversi74 and 76 and effecting a shift ot theclutch 35 out ot engagement with the clutch 29. .iVhereupoin the air pumps cease to operate and. continue idle until the air SIU pressure in the tire is lowered suiciently to enable the spring G3 to again gain control of the piston G1, thereby seating the latter upon the flange and thereby restoring the arm 68 to .its former position. Thereupon, the coil spring 79 retracts the levers il and 7G; thereby efl'ecting a rengagement of the clutches 29 and 35.

As heretofore stated; the apertures 7 0` 7 0 formed .in the governor arm 68 are adapted to enable the upward and downward adjustment of said arm for regulating and controlling the air pressure in the tire. If a high pressure is desired the Aarm 68 is adjusted downwardly, said adjustment being accompanied by a corresponding downward adjustment of the stop screw 64. To effect a lcwer tire pressure; the arm 68 is upwardly adjusted which adjustmentis accompanied by a corresponding upward adjustment of the stop screw 64:. In either case the adjustment ofthe stop screw (it limits the upward travel of the governor G1.. And the adjustment of the arm 68 causes an early or late oscillation of the levers 74 and 7 6 according to the direction of adjustment thereof. Normally, for co1n mon pressure in the tire, the pin 73 is positioned approximately midway of the `extremities of the slot 72 through the adjust-l ment of the arm 68. i

`l claim:

1. In a device of the class described, a` wheel a pair of air pump cylinders mounted upon the wheel; pistons operative in said cyliiulers; a crankshaft; rods operatively connecting the pump `pistons with the cranks on said crank shaft; a clutch rigidly mounted upon said crank shaft; a driving shaft; a clutch splined to said driving shaft and normally spring pressed into engagement with said crank shaft clutchgrmeans for rotating said crank shaft; a governor cylinder provided with ajlateral opening;

`in said cylinder and resiliently a piston movable in said cylinder and spring seated therein; an expansible gov `ernor bulb engaging said plston; said bulb being connected with the tire air pressure, whereby said piston is actuated when said bulb is pneumatically expanded in excess of a predetermined pressure; an arm operatively connected with said piston through said governor cylinder lateral opening; and

devices connecting said arm and said sliding i clutch whereby the clutches are disengaged when said governor piston is actuated by the expansion of the governor bulb.

2. In a device of the class described, a

Vwheel; a pneumatic tire on the wheel; an

air pump cylinder mounted upon the wheel;

a piston operative in said cylinder; a crank shaft; a rod connecting the pump piston with the crank on said shaft; an air conduit connecting the air pump with the tire; a clutch rigidly mounted upon said crank shaft; a driving shaft; aclutch splined to` 4said driving shaft and normally spring pressed. into engagement with said crank shaft clutch; means for rotating said crank shaft; a governor cylinder provided with ber, 1917. i i i,

ENOCH P. H UL'lIN. 

